Equations and Inequalities in One Variable

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1 Name Date lass Equations and Inequalities in One Variable. Which of the following is ( r ) s evaluated for r = 8 and s =? A 3 B Solve 3x 9= for x. A B 7 3. What is the best first step for solving the equation 8= z 8? A Add 8 to both sides of the equation. B Subtract 8 from both sides of the equation. Multiply both sides of the equation by.. Solve 5m+ 3= 3m 7. What is the value of m? A 5 B 5. Which inequality is graphed on the number line above? A x > 3 B x 3 x 3 6. Which graph best represents the solutions of b + 7>? A B 7. Which statement describes the solutions of 3x > 9? A The solutions are less than 3. B The solutions are less than 3. The solutions are greater than What are the solutions of 5y 9y + 6? A y B y y 9. The equation for finding the area of a rectangle is A = l w. What is the equation solved for w? A w = l A B w = l A A w = l 0. What is p = r + solved for r? p A r = p B r = p r = r 9

2 Name Date lass Equations and Inequalities in One Variable. Simplify 9x + 3y x.. Solve 9 = + x. 3. Solve 5z = 5 z.. Fill in the blanks to solve the equation. z 7 = 5 z = 5 z = 5. Solve 7x + 3 = 3+ 7x. 6. Sofia has been saving money to buy a new computer. For her birthday, Sofia s mother gave her twice what she had already saved. Now she has $35. a. Using x to represent the money Sofia saved before her mother s present, write an equation that represents the situation. b. How much money did Sofia have before her birthday? 7. Graph the inequality d. 8. 6p < a. Solve the inequality. b. Graph the solutions. 9. Fill in the blanks to solve the inequality. 7x + 6 9x x x 0. Solve x+ 3> x+ 7.. Eric has $5 to spend on back to school clothes. So far, he has spent $90. Write an inequality to show how much more money Eric can spend.. Rhonda sells textbooks. Her paycheck is found using the formula p = 30b + 5 where b is the number of textbooks she sells. Solve the formula for b. 3. Solve t 5 = u for t. 30

3 Name Date lass 5 Equations in Two Variables and Functions. Solve + x = 8 for x. What is the value of x? A 3 B 6 5. For which values is 3r = s true? A r = 3 and s = 3 B r = and s = 3 r = 8 and s = 6 3. Which ordered pair is a solution to y = 3 + x?. A (, ) B (, ) (, 5) Which equation matches the graph? A y = x B y = x y = + x 5. What is the value of f ( x) = 6+ x for x = 0? A B 6 6. What is the range of the following set of 3,, 7,,, 8? points: {( ) ( ) ( )} A { 3, 7, } B { 8,, 3,, 7, } { 8,, } 7. Which mapping diagram represents a function? A B 8. What is the fourth term of the sequence, 8,, 6, 0,,...? A B 6 9. What is the third term of the sequence defined by f( n) = n? A 3 B Which function defines the sequence 6, 8, 0,...? A f( n) = n + B f( n) = 3n + f( n) = 6n 33

4 Name Date lass 5 Equations in Two Variables and Functions. Solve 5y + = 6y. 6. Explain if the graph shown represents a function.. Determine if the following are solutions to y = 5x +. a. ( 3, ) b. (, ) 3. Fill in the table. x 0 x = y y 0 ( ) = y 7. Use the graph to determine when the g x. function h( x ) equals ( ) 0 0 = y 0 = y. Use the values from the table below to graph the solutions to y = x. x y Find the fifth term of a sequence represented by fn ( ) = 5n. 9. The terms in a sequence can be found using the recursive rule fn ( ) = fn ( ). Fill in the missing terms. 3,,, 5. Find the value of f( x) = 6+ x for x = Write a function that represents the sequence 7,,, 8,... 3

5 Name Date lass 6 Linear Functions. Which ordered pair is a solution to the equation y = x 7? A (, 6) B (0, 7) (8, ). Which of the following is a linear function? 5. What is the slope of the line below? A B 3. What describes the slope of a vertical line? A positive B 0 undefined. What is the slope of the line that contains the points (, ) and (, 8)? A 3 7 B A B Which of the following equations describes a line with an x-intercept of 3? A x + y = 3 B y = 3 x = 3 7. What is an equation of a linear function with a slope of 5 and y-intercept of 7? A y = 5 x 7 B y = 7x 5 y = 5x The table shows a relationship between the number of hours Fernando works and his paycheck. Hours (x) 3 Pay (y) Which equation could represent this relationship? A y = 0x + 5 B y = 5x + 0 y = x

6 Name Date lass 6 Linear Functions 9. Find the value of f(x) = 3x + 7 for x = Write an equation in slope-intercept form for a line that goes through the points (0, 6) and (, ). 3. Find the x-intercept and y-intercept of x = y 8. a. What is the x-intercept of the line graphed above? b. What is the y-intercept of the line? c. What is the slope of the line? mi. Katherine jogs 6. The distance she h travels in x hours is represented by mi k(x) = 6x. Julio jogs. The distance h he travels in x hours is represented by j(x) = x. a. Graph and label k(x) = 6x, and j(x) = x. d. Write an equation for the line.. a. Graph x = on the graph below. b. Who travels further in hours, and how far does this person travel? c. Which function has a greater slope? b. What is the domain of x =? c. What is the range of x =? 38

7 Name Date lass 7 Building Linear Functions. What is the slope of the line that contains the points (, 6) and (, )? A B 8 8. Which of the following is an arithmetic sequence? A,, 8, 6 B 5, 0, 5, 0 7, 8, 0, 3 3. What is the common difference of the sequence with the recursive rule f() = ; f(n) = f(n ) + 5? A B 5. f(x) = 6x 7; g(x) = 3x + 0 What is the sum of f(x) and g(x)? A 3x + 3 B 9x + 3 9x 3 5. f(x) = x + 3; g(x) = x + 8 Which of the following expressions is equal to h(x) if h(x) = f(x) g(x)? A 3x + B x + 5 3x What is the inverse of f(x) = x + 9? A f (x) = x + 9 B f (x) = x 9 f (x) = 9 x 7. A pet sitter originally charged clients $ per hour of sitting plus a set fee of $0, or T(h) = h + 0. The sitter decided to double the fees. Which of the following functions represents the doubled fees? A N(h) = 8h + 0 B N(h) = h + 0 N(h) = 8h Which inequality is represented by the graph shown? A y x + 3 B y > x + 3 y x Which ordered pair is a solution of the inequality on the graph? A (3, ) B (0, ) ( 3, )

8 Name Date lass 7 Building Linear Functions 0. Find the x-intercept and y-intercept of 6x 8y =.. n 3 6. a. Find the inverse of f(x) = x. b. Graph f(x) = x and the inverse function, f (x). f(x) 7 8 a. Find the common difference of the sequence. b. Write a recursive rule for the sequence. c. Write an explicit rule for the sequence. For, use the functions f(x) = 7x + 6 and g(x) = 6x Find h(x) = f(x) + g(x). 7. Determine whether (, 3) is a solution of y x Graph the inequality represented in Exercise Find h(x) = f(x) g(x).. Find h(x) = f(x). 5. Alisha has two piggy banks. The contents of one piggy bank can be represented by p(x) = $3x $. The contents of the second piggy bank can be represented by s(x) = $7x + $. Write a function that represents the total amount of money in the banks.

9 Name Date lass 8 Modeling with Linear Functions. f(x) = 0x + 5; g(x) = 8x 5 What is the sum of f(x) and g(x)? A 8x B x x +. Which correlation best describes the scatter plot below? 5. The table shows the number of employees in a company over five years. A Positive B Negative No correlation 3. Which of the following correlation coefficients indicates a strong negative correlation? A 0.8 B Which is the best equation of a line of fit for the data represented on the scatter plot? Which of the following is the best prediction of how many employees the company will have in 008? A 35 B What is the sum of the squared residuals shown on the table? y =.6x + 8 x y (actual) y (predicted) residuals A B y = x y = y = A 0.6 B The squared residual of line of fit A is.. The squared residual of line of fit B is.9. Which of the following statements best describes the lines? A Line A better fits the data. B Line B better fits the data. Not enough information is given to compare the lines of fit. 5

10 Name Date lass 8 Modeling with Linear Functions 8. Find the inverse of f(x) = x. 9. Make a scatter plot for the points (, ), (, ), (5, 5) and (7, 6).. a. omplete the table. p = 5x + x p (actual) p (predicted) residuals b. Find the sum of the squared residuals. 0. The table shows the number of runners in an annual race over four years. Year Number of Runners a. Draw a scatter plot and a trend line.. Keisha is trying to figure out which line of fit is better for the data presented on the table below, y = x + or y = 3x. x 0 y 0 a. Plot the data from the table on the graph below. b. Which is the best prediction for the number of runners in 03, 0 or 7? Explain your answer. b. Find the squared residual of the line of fit y = x +. c. Find the squared residual of the line of fit y = 3x. d. Which line better fits the data? 6

11 Name Date lass 9 Systems of Equations and Inequalities. Which correlation coefficient indicates a weak positive correlation? A 0. B Which ordered pair is the solution of the system graphed below? 5. How many solutions does the system y = 3x have? y = 3x A none B exactly one infinitely many 6. For which would you draw a dashed boundary line and shade to the left? A x B x < x 7. Which of the following is a solution of the system graphed below? A ( 3, 5) B (, 0) (5, 3) 3. What does it mean if (3, ) is a solution y = x of? y = x + 5 A (3, ) makes at least one of the equations true. B (3, ) makes both equations true. (3, ) makes exactly one of the equations true.. Solve y = x + 3 by substitution. x + y = 6 What is the solution? A ( 9, 6) B ( 3, 0) (, ) A (, 3) B (, ) (0, ) 8. The drama club is having a car wash as a fundraiser. They wash x cars at $5 each and y trucks at $8 each. They need to make at least $50. They will wash at least 5 trucks. Which system describes this situation? y 5 A 5x + 8y 50 B x > 5 5x + 8y > 50 y > 5 5x + 8y 50 9

12 Name Date lass 9 Systems of Equations and Inequalities 9. a. omplete the table. x y = x + 9 p (actual) p (predicted) residuals b. Find the sum of the squared residuals. 0. The graph of a system of linear equations is shown below. What is the solution of the system? 3. a. Tank A contains 35 gallons of water and is increasing at a rate of 5 gallons per minute. Write an equation to represent the situation. b. Tank B contains 00 gallons of water and is decreasing at a rate of 8 gallons per minute. Write an equation to represent the situation. c. Solve the system of equations to find in how many minutes the tanks contain the same amount of water and how much water that will be.. Tell whether ( 6, 0) is a solution of y > x +. y < x y = x 3. Solve by graphing:. y = x Use the graph below to give ordered pairs that are solutions and ordered pairs that are not solutions of the system. x + y = 0. Solve by elimination:. x y = 8 a. Solutions: b. Not solutions: 50

13 Name Date lass 0 Exponential Functions and Equations. How many solutions does the following system have? y = x y = 3x + A none B exactly one infinitely many. What is 9 simplified? A 8 B What is f(x) = x evaluated for x = 3? A B 6 6. Which of these sets of ordered pairs satisfies an exponential equation? A {(, 3), (, 9), (3, 7)} B {(, 7), (, ), (3, )} {(, 0), (, 0), (3, 30)} 5. An insect population doubles every week. The function f(x) = 0() x models the insect population after x weeks. To the nearest whole number, what will the population be after weeks? A 80 B 60 0, Jeffrey s savings account earns 3% interest each year. To find the amount after years, solve the equation f(x) = 350( ) x for x =. How much will Jeffrey have in his account after years, rounded to the nearest dollar? A $36 B $37 $7 7. Which of the following is a geometric sequence? A 3, 6,,, B, 8,, 6,,, 6, 56, 8. What is the sixth term of the geometric sequence 0, 5, 56,? A 6 B ompare the graph of g(x) = 6x with the graph of f(x) = x. Which of the following statements is true? A g(x) is vertically stretched. B g(x) is translated up. g(x) is vertically compressed. 0. Solve 5 = x for x. What is the value of x? A 5 B 0 3. Solve 36 7 = 6 y for y. What is the value of y? A 7 B 9 53

14 Name Date lass 0 Exponential Functions and Equations. Solve: y = x + 0. x + y = 8 3. a. omplete the table to find the values of the exponential equation y = x. x x = y y = = 0 b. Graph y = () x. 5. A population of 00 animals has a growth rate of 3% each year. At this growth rate, the function f(x) = 00(.3) x gives the population in x years. What is the population in 3 years? 6. 6, 8, 5, 6, is a geometric sequence. a. Find the common ratio of the sequence. b. Write a recursive rule for the sequence. c. Write an explicit rule for the sequence. 7. ompare the graphs of y = x and y = 3 x.. The following ordered pairs are solutions to an exponential equation: (0, ), (, 3), (, 9), (3, 7). Write the equation. 8. Solve 8 = y. 5

15 Name Date lass Modeling with Exponential Functions. The number of fruit flies in a jar triples every week. The function f(x) = 5(3) x models the insect population after x weeks. To the nearest whole number, what will the population be after weeks? A 60 B Which regression equation best fits the data shown in the table? x 0 3 y A y = x 5 B y = 5 x y = 3 x 3. Which of the following describes a situation in which the linear regression equation best fits the data? A exponential equation: r = 0.9 linear equation: r = 0.5 B exponential equation: r = 0.8 linear equation: r = 0.93 exponential equation: r = 0.7 linear equation: r = 0.7. Which ordered pairs satisfy an exponential function? A x Ben has $00 in his savings account. He is looking at two investment plans. Under plan A, he will increase his account balance by $0 a year. Under plan B, he will increase his account balance by 5% each year. Approximately how much will Ben save after 3 years with each plan? A Plan A: $60; Plan B: $5 B Plan A: $60; Plan B: $5 Plan A: $73; Plan B: $5 6. What is the average rate of change over the interval [0, ] for each equation? Equation A x 0 3 y Equation B f(x) = x A A: 5; B: B A: ; B: 0 A: ; B: 7. Which kind of model best describes this data set: {(, ), (, 3), (0, 5), (, 7), (, 9)}? y B x 0 3 y 0 6 x 0 3 y 9 6 A linear B exponential none of these 57

16 Name Date lass Modeling with Exponential Functions 8. a. omplete the table to find the values x 0 of y = x. x = y y = = b. Graph y = 8 0. a. omplete the table below to find the residuals of the data shown and the regression equation y = x. x y observed y predicted residual b. Describe the accuracy of the regression equation.. Ashley is deciding between two jobs. Job A pays $000 a month with a monthly raise of $85. Job B pays $000 a month with a monthly raise of %. a. Write a function to represent the monthly salary for job A. b. Write a function to represent the monthly salary for job B. 9. Lewis checked the balance of his savings account every month for months. The balances were $300, $0, $50, and $630. Would a linear or exponential function better represent the data? Explain. c. After how many months would Ashley have a higher salary at job B? 58

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